Apparatus for applying refractory cement



March 18, 1930. l.. FABER APPARATUS FOR APPLYING REFRACTORY CEMENVTFiled Feb. 15, 1927 MMM Patented Mar, E8, QS

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LEON FABER, 0F PHILADELPHIA, PENNSYLVANIA, ASSIGNQR T0 LEONARD B. BOT-FIELD, TRADING AS BOTFIELD REFRACTORIES COMPANY, 0F PHILADELPHIA,

PENNSYLVANIA APPARATUS non APPLYING Rn'rnncronx CEMENT' Application led.February 15, 1927. Serial No. 168,268.

My invention relates to an improvement in apparatus for applyingrefractory cement and more particularly to a so called gun for use inlining furnaces, ovens and the like.

As is well known, furnaces, ovens and the like are customarily providedwith a lining of refractory material, which may be and in many instancesis in the form of a refractory cement, which may be applied in aplastic' state and which heretofore has been usually applied manually,by means of a trowel.

The manual application 'of a cementitious lining to a furnace or ovenrequires a substantial amount of time and requires a degree of skill,since it is desirable that such .a lining be applied uniformly andsmoothly. In order to avoid the time and expense incident to the manualapplication of cementitious linings, efforts have been made to provideapparatus for effecting the application under the influence, forexample, of compressed yair. However, while more or less satisfactoryapparatus has been devised, such has not found general use due tocomplication of design, high cost and a lack of capacity for handlingthe heavier and more viscous'refractory cements.

Now, it is the object of my invention to provide an apparatus, or socalled gun, for the application of refractory cement to furnaces, ovensand the like, which will be of the simplest design, inexpensive to.produce and of a high degree of eiiiciency especially for handling heavyviscous cements. l

Having now indicated, in a general way, the nature and purpose of myinvention, I will proceed to a detailed description thereof withreference to the accompanying drawing, in which there is illustrated apreferred embodiment and in which The figure is a side view, partly insection, of an apparatus, or gun, .embodying my invention.

The apparatus comprises a body a, within which is a chamber b and fromwhich extends a handle c. Threaded through the rear lof the body andextending into the chamber b g is a nozzle d, therear of whichcommunicates pressed air pipe f. The air pipe is connected to the bodyby means of the connector g and the flow of air through the pipe, from asuitable source of compressed air with which the pipe is connected, iscontrolled by a valve h.

The bottom of the body is provided with an opening communicating withchamber b and into which is threaded an end of a supply pipe z'. Thesupply pipe z' is cut away at its lower end, as indicated at y'. A ventpipe 7e, of smaller diameter than pipe i, one end of which extendsthrough the wall of pipe z' at a point opposite to the upper end of thecut away portion y', extends for a distance parallel to the pipe z' andis secured thereto by a wrapping Z. As will be appreciated, if desiredthe pipe i may be iiexible without departing from my invention.

From lthe chamber a tapered passage m extends forwardly through the bodya and communicates with a nozzle a, the base of which is threaded on theforward end Aof the casing. As will be observed, from an inspection ofthe drawing, the tapered passage m is smaller at its end adjacent thechamber b than at its end adjacent the nozzle n and it will be furthernoted: that- 'the passage through the nozzle is -cylindrical and of adiameter the same as that of the larger end of the passage m.

In the operation of the device embodying my invention, the nozzle cl isadjusted into chamber b with relation to the upper end of pipe z' sothat on th'e discharge of air from the nozzle, cement of the consistencydesired to be applied, will be drawn through pipe 'i into chamber b anddischarged through passage m and nozzle n. The pipe z' is extended intoa bodylof refractory cement to be applied, the upper Vend pipe la beingat or above the surface of tie cement and compressed air is admitted tonozzle d by opening valve k.

drawn into pipe z' through pipe lo and causes the cement passing into'and through pipe z' to be agitated and thoroughly mixed. VThe cementdrawn through pipe i enters chamber b from which it is discharged'through tapered passage fm. and through and out of nozzle n under theinfluence of the air from nozzle ci. Since the passage m isv taperedtoward the chamber b, it acts as a mixing chamber into which the cemententers at a higher velocity than that at which it leaves and from whichthe cement is discharged into the cylindrical nozzle n through which ittravels at a relatively constant velocity7 for discharge on the Wall ofthe furnace or oven to be lined. y

It will now be noted that the cement is, as it were, atomized in thetapered passage m, but on discharge from nozzle n, the passage throughwhich is cylindrical, the cement will be homogeneous and will not have atendency to spatter on striking the :furnace wall, being, as it were,laid thereon.

Having now fully described my invention, what I claim and desire toprotect by Letters Patent is 1. Apparatus foriapplying plastic materialcomprising a head having therein a chamber, a discharge passage fromsaid chamber increasing in area outwardly from the chamber, an inletpassage to the chamber for compressed air or vapor aligned with thedischarge passage, and a second inlet passage to the chamber, a tubecommunicating with said second inlet passage, and an air conduitcommunicating at one end with the interior of the tube adj acent itsintake end, the other end of said conduit being arranged to open to theatmosphere when the intake end of the tube is immersed in the plasticmaterial, whereby compressed air or vapor admitted through the firstinlet passage serves to pro# duce a flow of` plastic material and airthrough the tube into the chamber and to discharge the same therefromthrough the dis charge passage.

2. Apparatus for applying plastic material comprising a head havingtherein a chamber, a discharge passage from said chamber increasing inarea outwardly from the chamber, an inlet passage to thechamber forcompressed air or vapor aligned with the discharge passage, andl asecond inlet passage to the chamber, a nozzle having a cylindricalpassage therethrough aligned with the discharge passage, a tubecommunicating with said second inlet passage, and an air conduitcommunicatin at one end with the interior 0f the tube ad] acent itsintake end, the other end of said conduit being arranged to open to theatmosphere when the intake end of the tube is immersed in the plasticmaterial, whereby compressed air or vapor admitted through the firstinlet passage serves to produce a flow of plastic material andv airthrough the tube into the chamber and to dischargethe same therefromthrough the discharge passage and the nozzle.-

In testimony of vwhich invention, I have hereunto set my hand, atPhiladelphia, Pa. on this 8th day of Feb., 1927.

LEON FABER.

